Die mechanism



Patented Jan. 11, 1927.

UNITED STATES 1,613,961 PATENT OFFICE.

MORRIS SCHWARTZ, O1 CHICAGO, ILLINCIS, ASSIGN'OB O1 QN'E-HALF TWINNIFRED B. PABISH, O1 CHICAGO, ILLINOIS.

DIE MECHANISM.

. App1iceition mm Decem'ber My invention resides in an improved diemechanismaflapted to the formation of holl0w extensions of vbodies ofsheet material. The mechanism of my invention .enables 3 the fornriationof such. "extensions without cracks Q1 fissures in the product. Themechanism of myinvention ineludes male and femle members and a springyieldingly pressing one cf the die me mbers toward .u the other wit-h apressure sufficierit to exert drawing engagement of the die members upnthe 'maiterialinterposed therebetween..

My invention is of partic ular ser vice in i the formation of tubular orcyli ndrical prol5 jections, and when thus employed the male member isin the form of'a cylindrical punch having a conical wo rking end and thefemale' me mben is. pr0vided with a conical cavity conformixig-inshapeto the conical end 2 of the punch.

Hitherto there was no tendency -te draw the-sheet materisil as the punchdescended with themesult that fissuies were liabl e to form at the basesof the extension. T

By grippingthe work*between the two die members the sheet material isdrawn as the die operates' thereon to relieve the fissure formingtendency.

The invention will be more fully explained lgy reference to theaccompanyin drawing in which Fig. 1 is a view partiallly in sectio nsind partially in elevation of't-h pre-- fernad forinof inechani sm thediemembers being in Sepa1"ated relation; Fig 2 illustrateS the punchandfemalemember' of Ehe die inthe early stage of an operation; ]3 ig..

' 3 illustrates alafer stage in the -peration;

-Fig 4. illustrates the final stage in the Ope'ration; und Fig'.f5 isaperspectix* view illustrating the resulting p1oduci Lik6 parts'are.ind'czited by similar, chata'eters et reference throughout thedifferent ;figres.

The malejmember 1 is shown in the form ef a cylindricalpunch having atapering 01' conical working end 2. The feinale membei 3 is alsiopreferably, thogh not ne cessarily, cylindrical. This female member isformed with a tapeving .0r conical ca"vit '5 that confdrms in shape tothe conical punc1 end 2. 'The1eis asupport 15 for the sheet inaterial(illustrated at 6) that is to be'operated updh. This support is fo'rmedwith a cylixidrical opening 7 which is of a diamet er conf0rming to theeXt6rnal diameter of 10, 1923. Selial mi. 879,79'6.

the tub'ular extension 8 (Fig. 5) that is t lie forn'1ed. The pun'ch 1conforms in size 10 the bore 0f the tubular extension 8. The annular clearance between the punch 1 and suppoxt 5 is substantially equal to thethickness of the sheet metal from Which said tubular extension isforined. Both die members are adapted t0' reciprocate in this open'- ingin performiflg their functioi1. .The die member 3 carri'es vertical ins9 which project dewnwardly froni t 1e base thereof, thes e pins slidingin vertical holes formed in the mounting 10for the support 5. These pinsbea1 upon a. metal pl ai;e 11 which bezirs upon the top end of a springcushioi1 12 7 which is preferably a body of rubber. This body of rubberis held in assembly With the plate 11 by means of the plate 13 engagingthe bottorn spring cushion, a holt 14 sci ewecl in the part 10, and anut 15 up01'1 the lowerend of the holt, this nut clamping the cushi0n 12between the plates 11 and 13. As illustrated, ehe members of the die arevertically a1iang@d, the female 'member 3 and its supporting cushion 12heilig lower most. This cushion exerts suflieient pres-= sure to clamp'the sheet metal 6, er other. sheet material, between"the punch andfefnale membe'r with suificient force to cause i sired length whenthismuch of-the inetal is added to by the metal drawn from1;hesurrounding body of the sheet material. \Zhile I have herein shown andparticularly described v the preferred embodiment of 1ny invention I denot wish to be limited t the preeise details of construction sho'wn,

as changes may'readilybe made Without departing from the spitit of myinvention; but' having thus described my' inVen'tion, I cl'aim as newand desire t.secnre by Letters Batent the fqllowingz" Die mechanism forshapin'g sheet material including a support f01 the sheet ma-' -terial;a male die member in the form of a punch npon the exterior ofsa1deupp'ort! a:nd having a tapering working end; a fenmle die, men1berhaving a tapering cavity receiving the tapering end of the punch andnormally received in, an opening in said supp0rt, und in which openingboth die rhem bers are reciprocable, und between which and the punchmember a cleaxance, substantially equal to the thickness of theysheetI-nmteriztlbeing Op'erated upon, intervenes 150 10 recewe the sheetmater1al bemg worked upon; md means for rnaintaining clamping engagementof said die members with the sheet material after he initial punchingoperation, to enable the sheet material 150 be drawn by the die membersinto said c1earance as said die members move together.

In wifness whereof, I hereunto subscribe my name this 14th day 0f MarchA. D. 1923.

MORRIS SCHWARTZ.

